Improvement work costing about £120,000 is due to start at a Hartlepool park.
The stream in the upper Burn Valley Gardens is to be re-routed to make it more natural and easier to access, Hartlepool Council says.
The work is part of the Wild Green Spaces in Hartlepool scheme, funded by the Environment Agency and the National Lottery.
The area will be closed to the public during the works which are expected to last 12 weeks.
Deborah Jefferson from the council's Countryside Team said: "By re-aligning the beck, we aim to create meanders that will slow down its flow in times of high rainfall and make it easier to reach the water to observe wildlife."